problem description
Mini Program uses canvas to display the generated QR code picture, but the computer shows that the mobile phone report indexof is undefined??.
the environmental background of the problems and what methods you have tried
there is no indexof method in searching js files and referenced files. I really can"t help it. Please give me your advice. Thank you very much!
related codes
/ / Please paste the code text below (do not replace the code with pictures)